red. The tjet amulet an amulet linked with the blood of Isis is red (sometimes green, but that the colour of her husband). All the text I know use red if they precise a colour. Which is rare enough to make clear blood is red.
– GibetFeb 13 '18 at 19:26

@Gibet Why aren't you posting that as an answer???
– OuroborosFeb 21 '18 at 14:13

@Ouroboros I tend to avoid putting answers, except if absolutely necessary. But if this answer goes with you I welcome you to paste it in an official answer and mark this question as answered. This is very good for the stats. It will raise up your score as well. This is also good.
– GibetFeb 25 '18 at 7:19

And there on the island stood Set himself in the form of a gigantic
red hippopotamus.

The song of praise which was sung to recall Set's defeat says:

Eat the flesh of the vanquished, drink the blood of the red
hippopotamus, burn his bones with fire!

Thus, Set, one of the Egyptian gods, apparently did bleed. However, one could argue that this was only because he was in the form of an animal at the time. Indeed, in the entire rest of the book no other gods bleed.

I would assume yes, they bleed.
Especially if you consider that Pharaohs were considered to be not only representatives but hosts and therefore gods themselves.
Pharaohs were often associated with Horus.